diff --git a/pixi.lock b/pixi.lock
index 2ca5a41f2..ef4ffe709 100644
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-  - python_abi 3.12.* *_cp312
-  license: BSD-2-Clause
-  license_family: BSD
-  purls:
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-  size: 85817
-  timestamp: 1760964243832
-- conda: https://conda.anaconda.org/conda-forge/linux-64/wrapt-2.0.0-py313h07c4f96_0.conda
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-  - python_abi 3.12.* *_cp312
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-  size: 82028
-  timestamp: 1760964522891
-- conda: https://conda.anaconda.org/conda-forge/osx-64/wrapt-2.0.0-py313hf050af9_0.conda
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-  depends:
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-  - python >=3.13,<3.14.0a0
-  - python_abi 3.13.* *_cp313
-  license: BSD-2-Clause
-  license_family: BSD
-  purls:
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-  size: 83070
-  timestamp: 1760964583635
-- conda: https://conda.anaconda.org/conda-forge/osx-arm64/wrapt-2.0.0-py312h4409184_0.conda
-  sha256: 8e9748511f5d53b7368901b5e4e35fd5e6d3bc8e3217a9ed09c86778da66c7dc
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-  depends:
-  - __osx >=11.0
-  - python >=3.12,<3.13.0a0
-  - python >=3.12,<3.13.0a0 *_cpython
-  - python_abi 3.12.* *_cp312
-  license: BSD-2-Clause
-  license_family: BSD
-  purls:
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-  size: 82962
-  timestamp: 1760964727371
-- conda: https://conda.anaconda.org/conda-forge/osx-arm64/wrapt-2.0.0-py313h6535dbc_0.conda
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-  depends:
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-  - python >=3.13,<3.14.0a0 *_cp313
-  - python_abi 3.13.* *_cp313
-  license: BSD-2-Clause
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-  license: BSD-2-Clause
-  license_family: BSD
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-  size: 84707
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+- pypi: https://files.pythonhosted.org/packages/1e/2f/60c51304fbdf47ce992d9eefa61fbd2c0e64feee60aaa439baf42ea6f40b/wrapt-2.1.1-cp313-cp313-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl
+  name: wrapt
+  version: 2.1.1
+  sha256: 5797f65e4d58065a49088c3b32af5410751cd485e83ba89e5a45e2aa8905af98
+  requires_dist:
+  - pytest ; extra == 'dev'
+  - setuptools ; extra == 'dev'
+  requires_python: '>=3.9'
+- pypi: https://files.pythonhosted.org/packages/5f/66/6a09e0294c4fc8c26028a03a15191721c9271672467cc33e6617ee0d91d2/wrapt-2.1.1-cp313-cp313-win_amd64.whl
+  name: wrapt
+  version: 2.1.1
+  sha256: cbfee35c711046b15147b0ae7db9b976f01c9520e6636d992cd9e69e5e2b03b1
+  requires_dist:
+  - pytest ; extra == 'dev'
+  - setuptools ; extra == 'dev'
+  requires_python: '>=3.9'
+- pypi: https://files.pythonhosted.org/packages/6f/07/7ed02daa35542023464e3c8b7cb937fa61f6c61c0361ecf8f5fecf8ad8da/wrapt-2.1.1-cp312-cp312-macosx_11_0_arm64.whl
+  name: wrapt
+  version: 2.1.1
+  sha256: 7c0300007836373d1c2df105b40777986accb738053a92fe09b615a7a4547e9f
+  requires_dist:
+  - pytest ; extra == 'dev'
+  - setuptools ; extra == 'dev'
+  requires_python: '>=3.9'
+- pypi: https://files.pythonhosted.org/packages/9d/33/5b8f89a82a9859ce82da4870c799ad11ce15648b6e1c820fec3e23f4a19f/wrapt-2.1.1-cp313-cp313-macosx_11_0_arm64.whl
+  name: wrapt
+  version: 2.1.1
+  sha256: 428cfc801925454395aa468ba7ddb3ed63dc0d881df7b81626cdd433b4e2b11b
+  requires_dist:
+  - pytest ; extra == 'dev'
+  - setuptools ; extra == 'dev'
+  requires_python: '>=3.9'
+- pypi: https://files.pythonhosted.org/packages/c4/60/a237a4e4a36f6d966061ccc9b017627d448161b19e0a3ab80a7c7c97f859/wrapt-2.1.1-cp312-cp312-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl
+  name: wrapt
+  version: 2.1.1
+  sha256: 2b27c070fd1132ab23957bcd4ee3ba707a91e653a9268dc1afbd39b77b2799f7
+  requires_dist:
+  - pytest ; extra == 'dev'
+  - setuptools ; extra == 'dev'
+  requires_python: '>=3.9'
+- pypi: https://files.pythonhosted.org/packages/df/cb/4d5255d19bbd12be7f8ee2c1fb4269dddec9cef777ef17174d357468efaa/wrapt-2.1.1-cp312-cp312-macosx_10_13_x86_64.whl
+  name: wrapt
+  version: 2.1.1
+  sha256: ab8e3793b239db021a18782a5823fcdea63b9fe75d0e340957f5828ef55fcc02
+  requires_dist:
+  - pytest ; extra == 'dev'
+  - setuptools ; extra == 'dev'
+  requires_python: '>=3.9'
+- pypi: https://files.pythonhosted.org/packages/f7/ca/3cf290212855b19af9fcc41b725b5620b32f470d6aad970c2593500817eb/wrapt-2.1.1-cp313-cp313-macosx_10_13_x86_64.whl
+  name: wrapt
+  version: 2.1.1
+  sha256: ce9646e17fa7c3e2e7a87e696c7de66512c2b4f789a8db95c613588985a2e139
+  requires_dist:
+  - pytest ; extra == 'dev'
+  - setuptools ; extra == 'dev'
+  requires_python: '>=3.9'
 - conda: https://conda.anaconda.org/conda-forge/linux-64/xorg-libice-1.1.2-hb9d3cd8_0.conda
   sha256: c12396aabb21244c212e488bbdc4abcdef0b7404b15761d9329f5a4a39113c4b
   md5: fb901ff28063514abb6046c9ec2c4a45
diff --git a/pixi.toml b/pixi.toml
index 1ddd4f8b6..c977d1765 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -14,7 +14,6 @@ version = "0.50.0a1"
 
 [dependencies]
 scipy=">=1.6,<1.16"
-formulaic=">=1.1.0"
 pandas=">=1.1.0"
 numba=">=0.58.0"
 seaborn=">=0.13.2"
@@ -26,6 +25,7 @@ joblib=">=1.4.2,<2"
 
 [pypi-dependencies]
 maketables = ">=0.1.0"
+formulaic = { git = "https://github.com/leostimpfle/formulaic", rev = "add_interaction_operator" }
 
 [feature.dev]
 platforms = ["linux-64", "osx-arm64", "osx-64"]
diff --git a/pyfixest/estimation/formula/model_matrix.py b/pyfixest/estimation/formula/model_matrix.py
index e88111876..290896aba 100644
--- a/pyfixest/estimation/formula/model_matrix.py
+++ b/pyfixest/estimation/formula/model_matrix.py
@@ -329,7 +329,7 @@ def create_model_matrix(
         output="pandas",
         context={
             "log": log,  # custom log settings infinite to nan
-            "i": factor_interaction,  # fixest::i()-style syntax
+            # "i": factor_interaction,  # fixest::i()-style syntax
             "__fixed_effect__": _factorize,
         }
         | {**capture_context(context)},
diff --git a/tests/test_i.py b/tests/test_i.py
index 0b5b54b2f..27bc199b4 100644
--- a/tests/test_i.py
+++ b/tests/test_i.py
@@ -87,7 +87,16 @@ def assert_models_match(
         f"Coefficient count mismatch: py={len(py_names)}, r={len(r_names)}"
     )
     if check_names:
-        assert py_names == r_names, f"Name mismatch:\n  py={py_names}\n  r={r_names}"
+
+        def translate(name: str) -> str:
+            if name == "Intercept":
+                return name
+            else:
+                return "::".join(re.findall(r"(\w+)\[(\w+)\]", name)[0])
+
+        assert [translate(n) for n in py_names] == r_names, (
+            f"Name mismatch:\n  py={py_names}\n  r={r_names}"
+        )
     np.testing.assert_allclose(py_values, r_values, rtol=RTOL, atol=ATOL)
 
 
@@ -160,10 +169,22 @@ def df_test() -> pd.DataFrame:
 @pytest.mark.parametrize(
     "formula,excluded_coef",
     [
-        ("dep_var ~ i(rel_year, ref=1.0)", "rel_year::1"),
-        ("dep_var ~ i(rel_year, ref=-2.0)", "rel_year::-2"),
-        ("dep_var ~ i(rel_year, treat, ref=1.0)", "rel_year::1:treat"),
-        ("dep_var ~ i(rel_year, treat, ref=-2.0)", "rel_year::-2:treat"),
+        (
+            "dep_var ~ i(C(rel_year, contr.treatment(1.0), reduce_rank=True))",
+            "rel_year[1.0]",
+        ),
+        (
+            "dep_var ~ i(C(rel_year, contr.treatment(-2.0), reduce_rank=True))",
+            "rel_year[-2.0]",
+        ),
+        (
+            "dep_var ~ i(C(rel_year, contr.treatment(1.0), reduce_rank=True), treat)",
+            "rel_year[1.0]:treat",
+        ),
+        (
+            "dep_var ~ i(C(rel_year, contr.treatment(2.0), reduce_rank=True), treat)",
+            "rel_year[2.0]:treat",
+        ),
     ],
 )
 def test_i_reference_exclusion(df_het, formula, excluded_coef):
@@ -176,23 +197,35 @@ def test_i_reference_exclusion(df_het, formula, excluded_coef):
 
 @pytest.mark.against_r_core
 @pytest.mark.parametrize(
-    "fml",
+    "fml_py, fml_r",
     [
-        "dep_var ~ i(state)",
-        "dep_var ~ i(state, ref = 1)",
-        "dep_var ~ i(state, year)",
-        "dep_var ~ i(state, year, ref = 1)",
-        "dep_var ~ i(state, year) | state",
-        "dep_var ~ i(state, year, ref = 1) | state",
+        ("dep_var ~ i(C(state, reduce_rank=True))", "dep_var ~ i(state)"),
+        (
+            "dep_var ~ i(C(state, contr.treatment(1), reduce_rank=True))",
+            "dep_var ~ i(state, ref = 1)",
+        ),
+        ("dep_var ~ i(C(state, reduce_rank=False), year)", "dep_var ~ i(state, year)"),
+        (
+            "dep_var ~ i(C(state, contr.treatment(1), reduce_rank=True), year)",
+            "dep_var ~ i(state, year, ref = 1)",
+        ),
+        (
+            "dep_var ~ i(C(state, reduce_rank=False), year) | state",
+            "dep_var ~ i(state, year) | state",
+        ),
+        (
+            "dep_var ~ i(C(state, contr.treatment(1), reduce_rank=True), year) | state",
+            "dep_var ~ i(state, year, ref = 1) | state",
+        ),
     ],
 )
-def test_i_vs_fixest(fml):
+def test_i_vs_fixest(fml_py, fml_r):
     """Test i() against R fixest."""
     df = pd.read_csv("pyfixest/did/data/df_het.csv")
     df["X"] = np.random.normal(df.shape[0])
 
-    fit_py = feols(fml, df)
-    fit_r = fixest.feols(ro.Formula(fml), df)
+    fit_py = feols(fml_py, df)
+    fit_r = fixest.feols(ro.Formula(fml_r), df)
     np.testing.assert_allclose(
         fit_py.coef().values, np.array(fit_r.rx2("coefficients"))
     )
@@ -220,29 +253,45 @@ def test_no_intercept_all_levels(df_test, fml):
 
 @pytest.mark.against_r_core
 @pytest.mark.parametrize(
-    "fml",
+    "fml_py, fml_r",
     [
-        "Y ~ 0 + i(f_str, ref='apple')",  # No intercept + explicit ref
-        "Y ~ -1 + i(f_str, ref='banana')",  # Same with different ref
+        (
+            "Y ~ 0 + i(C(f_str, contr.treatment('apple'), reduce_rank=True))",
+            "Y ~ 0 + i(f_str, ref='apple')",
+        ),  # No intercept + explicit ref
+        (
+            "Y ~ -1 + i(C(f_str, contr.treatment('banana'), reduce_rank=True))",
+            "Y ~ -1 + i(f_str, ref='banana')",
+        ),  # Same with different ref
     ],
 )
-def test_no_intercept_with_ref(df_test, fml):
+def test_no_intercept_with_ref(df_test, fml_py, fml_r):
     """Test no intercept with explicit reference level."""
-    py_names, py_values, r_names, r_values = compare_with_r(fml, df_test)
+    py_names, py_values, r_names, r_values = compare_with_r(
+        r_fml=fml_r, df=df_test, py_fml=fml_py
+    )
     assert_models_match(py_names, py_values, r_names, r_values)
 
 
 @pytest.mark.against_r_core
 @pytest.mark.parametrize(
-    "fml",
+    "fml_py, fml_r",
     [
-        "Y ~ 1 + i(f_str)",  # With intercept, drop first level
-        "Y ~ i(f_str)",  # Same (intercept implicit)
+        (
+            "Y ~ 1 + i(C(f_str, reduce_rank=True))",
+            "Y ~ 1 + i(f_str)",
+        ),  # With intercept, drop first level
+        (
+            "Y ~ i(C(f_str, reduce_rank=True))",
+            "Y ~ i(f_str)",
+        ),  # Same (intercept implicit)
     ],
 )
-def test_with_intercept_drop_level(df_test, fml):
+def test_with_intercept_drop_level(df_test, fml_py, fml_r):
     """Test that with intercept, first level is dropped."""
-    py_names, py_values, r_names, r_values = compare_with_r(fml, df_test)
+    py_names, py_values, r_names, r_values = compare_with_r(
+        py_fml=fml_py, r_fml=fml_r, df=df_test
+    )
     assert_models_match(py_names, py_values, r_names, r_values)